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Publications

2014

Wastewater and greywater reuse on irrigation in centralized and decentralized systems - An integrated approach on water quality, energy consumption and CO2 emissions

Authors
Matos, C; Pereira, S; Amorim, EV; Bentes, I; Briga Sa, A;

Publication
SCIENCE OF THE TOTAL ENVIRONMENT

Abstract
Wastewater and greywater have different scales of end-uses in irrigation in Portugal. Wastewater is treated in a central wastewater treatment plant and reused in public/private large areas of irrigation, like agriculture, public gardens and golf courses. On the contrary, greywater reuse is generally applied in in situ small scales, treated and used in the same place, generally in the production site. The main aim of this paper is to compare the two types of systems: a wastewater centralized reuse system (WWCRS) and a greywater decentralized reuse system (GWDRS) in terms of water quality, energy consumption and CO2 emissions. In this paper, the main characteristics of both streams are presented and the degree of treatment required in each stream is analyzed. The advantages and disadvantages of its reuse in different scales, in terms of water quality, energy consumption and CO2 emissions are discussed. A methodology to calculate the energy consumptions and CO2 emissions related to wastewater treatment that may be applied in different cases is presented. A hypothetical example of the two systems: one referring to a WWCRS and the other to a GWDRS is presented. The energy consumption and the CO2 emissions are analyzed and compared. The WWCRS needs a higher degree of treatment and so it spends more energy and leads to more CO2 emissions to the environment than the GWDRS that consumed between 11.8 and 37.5% of the energy consumed in the WWCRS considering the same number of inhabitants served.

Supervised
thesis

2017

Potencial da energia solar concentrada para a produção de eletricidade em Portugal

Author
Ana Catarina Redondo Gonçalves

Institution
UTAD

2017

Veículos ligeiros sem emissões na Europa: projeções de mercado e consequências

Author
Cecília Alexandra Henriques Menezes

Institution
UTAD

2017

A tecnologia de hidrogénio: estudo de um sistema de propulsão alternativo para o futuro do setor logístico

Author
Catia Azevedo Moura

Institution
UTAD

2016

Contributos para implementação de Parques Eólicos Offshore em águas profundas. Tecnologias e desafios

Author
Tiago Samuel Teixeira Azevedo

Institution
UTAD

2016

Veículos Elétricos: Impactos na Rede Elétrica

Author
Tiago Luís Ventura Araújo

Institution
UTAD